The best way to treat a cold sore is to go and see your doctor. They also have lip balms that you can apply to the infected area. It may sting at first but that means its working.
To temporarily hide a cold sore, apply a layer of liquid bandage to cover the entire sore and allow to dry completely. Apply another layer and allow to dry again. What this does is cover the sore and provide a smooth surface for the application of lip color or lipstick, and also protects the sore from further infection.
When completely dry, use a lip brush (this can be sterilized by soaking in boiling water and bleach) and apply a dark enough shade of lipstick that will cover the cold sore, and sterilize the brush again after use. Just ensure the cold sore is completely covered with the liquid bandage before applying lip-color because if not, the lip-color/lipstick could irritate/worsen the sore. Make sure to use a dark enough shade of lipstick to hide the sore.
To remove, wash off carefully and make sure to dry the cold sore as much as possible with alcohol. Do not use this or any method that "seals" the cold sore too often, as it will interfere with the healing and drying process. Hormonal changes can sometimes prompt an outbreak.
Don't be surprised if certain forms of birth control (such as the morning after pill) cause an outbreak.
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